May 4, 1939: A demonstration of British aerial firepower

May 4, 1939 — The Royal Air Force (RAF) lines up its premier fighter planes on the tarmac at the RAF Duxford airfield in England — the Supermarine Spitfires, pictured above. The plane had only been introduced into the RAF the year prior on this very airfield, piloted by men from 19 Squadron, RAF Duxford. Spitfires […]